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Fair Value Measurements - Summary of Carrying Amount and Fair Values of Financial Instruments Reported on the Balance Sheets (Details) - USD ($) $ in Thousands | Dec. 31, 2018 | Dec. 31, 2017
--- | --- | ---
Balance sheet assets |  |
Securities available for sale | $ 721,369 | $ 641,382
Securities held to maturity | 65,679 | 73,749
Carrying Amount |  |
Balance sheet assets |  |
Cash and due from banks | 91,511 | 91,084
Federal funds sold | 1,714 | 1,223
Interest-bearing deposits | 106,512 | 63,661
Securities available for sale | 721,369 | 641,382
Securities held to maturity | 65,679 | 73,749
Other investments, at cost | 26,654 | 26,661
Loans held for sale | 392 | 3,155
Derivative financial instruments | 3,023 | 3,589
Portfolio loans, net | 4,306,525 | 4,054,473
State tax credits held for sale | 37,587 | 43,468
Accrued interest receivable | 16,069 | 14,069
Balance sheet liabilities |  |
Deposits | 4,587,985 | 4,156,414
Subordinated debentures and notes | 118,156 | 118,105
Federal Home Loan Bank advances | 70,000 | 172,743
Other borrowings | 223,450 | 253,674
Derivative financial instruments | 3,023 | 3,589
Accrued interest payable | 1,977 | 1,730
Estimated fair value |  |
Balance sheet assets |  |
Cash and due from banks | 91,511 | 91,084
Federal funds sold | 1,714 | 1,223
Interest-bearing deposits | 106,512 | 63,661
Securities available for sale | 721,369 | 641,382
Securities held to maturity | 63,934 | 73,458
Other investments, at cost | 26,654 | 26,661
Loans held for sale | 392 | 3,155
Derivative financial instruments | 3,023 | 3,589
Portfolio loans, net | 4,253,239 | 4,096,741
State tax credits held for sale | 39,169 | 44,271
Accrued interest receivable | 16,069 | 14,069
Balance sheet liabilities |  |
Deposits | 4,583,047 | 4,153,323
Subordinated debentures and notes | 106,316 | 105,031
Federal Home Loan Bank advances | 70,000 | 172,893
Other borrowings | 223,260 | 253,530
Derivative financial instruments | 3,023 | 3,589
Accrued interest payable | $ 1,977 | $ 1,730

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